<nb-layout>
  <nb-layout-header fixed>
    <theme-switcher></theme-switcher>
    <nav-actions></nav-actions>
    <header-user></header-user>
  </nb-layout-header>

  <nb-layout-column class="chat-index">
    <router-outlet></router-outlet>
  </nb-layout-column>
</nb-layout>
